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bpo-41916: allow cross-compiled python to have -pthread set for CXX #22525

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Jan 5, 2023
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bpo-41916: allow cross-compiled python to have -pthread set for CXX #22525

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2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Build/2022-03-04-10-47-23.bpo-41916.1d2GLU.rst
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Original file line number Diff line number Diff line change
@@ -0,0 +1,2 @@
Allow override of ac_cv_cxx_thread so that cross compiled python can set
-pthread for CXX.
13 changes: 10 additions & 3 deletions configure
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12 changes: 7 additions & 5 deletions configure.ac
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Original file line number Diff line number Diff line change
Expand Up @@ -2664,11 +2664,10 @@ fi

# If we have set a CC compiler flag for thread support then
# check if it works for CXX, too.
ac_cv_cxx_thread=no
if test ! -z "$CXX"
then
AC_MSG_CHECKING(whether $CXX also accepts flags for thread support)
ac_save_cxx="$CXX"
AC_CACHE_CHECK([whether $CXX also accepts flags for thread support], [ac_cv_cxx_thread],
[ac_save_cxx="$CXX"

if test "$ac_cv_kpthread" = "yes"
then
Expand All @@ -2682,6 +2681,8 @@ elif test "$ac_cv_pthread" = "yes"
then
CXX="$CXX -pthread"
ac_cv_cxx_thread=yes
else
ac_cv_cxx_thread=no
fi

if test $ac_cv_cxx_thread = yes
Expand All @@ -2697,9 +2698,10 @@ then
fi
rm -fr conftest*
fi
AC_MSG_RESULT($ac_cv_cxx_thread)
CXX="$ac_save_cxx"])
else
ac_cv_cxx_thread=no
fi
CXX="$ac_save_cxx"

dnl # check for ANSI or K&R ("traditional") preprocessor
dnl AC_MSG_CHECKING(for C preprocessor type)
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